Apparatus for the spraying of pulverulent materials



July 27, 1954 W. D. JONES ET A1. 2,684,874

APPARATUS FOR THE SPRAYING OF' PULVERULENT MATERIALS Original Filed June 22, 1951 60 'll/allah @ad Jam: ...a

j er@ Diczinm Patented July 27, 1954 APPARATUS FOR THE SPRAYING OF PULVERULENT MATERIALS William David Jones and Robert Dickinson, London, England, assignors to Schori Metallising Process Limited, London, England Original application June 22, 1951, Serial No. 232,916. Divided and this application July 10, 1952, Serial No. 298,098

3 Claims.

This invention relates to apparatus for spraying metal or other fusible material of the kind in which the material in pulverulent form is conveyed into the apparatus in a stream of gas and fused and sprayed at a nozzle, such apparatus incorporating valve controlled conduits for the con- Veyal of the powdered metal in a suitable medium, a combustible gas, oxygen and compressed an'.

The invention consists in means for supplying powdered metal or other fusible material to a spraying apparatus comprising a container for the powdered material, said container having an outlet at the bottom through which the material is fed by gravity, a chamber into which said outlet opens, said chamber having an inlet for connection to a supply of powder conveying gas under pressure, said chamber having an outlet communicating with the spraying apparatus.

Referring to the drawing which is a sectional elevation of the apparatus powdered material is supplied from a container 63 by gravity feed through a nozzle 6d with which an adjustable feed control spindle 65 co-operates. The nozzle 64 projects into a chamber G6 having small inclined holes Gl which open into an annular chamber t8 to which the powder conveying gas is supplied through nozzle Sl. Conveying gas under pressure entering the chamber B8 through the holes El entrains the powder enteringthe chamber and passes therefrom by the outlet 'lil and thence to the spraying apparatus.

An equalising pipe Ei connects the chamber 55 with the space above the powder in the container to ensure a steady ilow of powder through nozzle 64. A vibrating device i2 of any known kind is mounted on the powder container.

The conveying gas is supplied by a hose not shown, to the inlet nozzle E9 of the powder container.

The outlet l0 of the chamber 6G of the powder supply container 63 is connected by a hose not shown to the spraying apparatus.

The gas for conveying the powdered material is preferably a combustible gas such as coal gas as this will provide additional heat to fuse the material being sprayed but air may be used.

The apparatus may be used to supply spraying apparatus with any material which melts or becomes plastic at the temperature of the llame, for example, metals such as zinc, lead, tin, aluminium, copper and steel or non-metallic materials which do not decompose within their melting range such as sulphur, shellac, polyethylene, cellulose acetate butyrate, waxes and synthetic elastomer.

We claim:

1. Means for supplying metal powder or other powdered fusible material to a spraying apparatus, comprising in combination a container for the powdered material having an outlet in the bottom thereof through which the powdered material flows by gravity, a chamber of greater cross sectional area than said outlet and which receives the material which falls through said outlet, a valve which cooperates with the lower end of the outlet and vertically adjustable for determining the rate of flow of powder into the chamber, an inlet at the lower portion of the chamber and below said outlet for supplying gas under pressure to the chamber, and an outlet for the chamber above said inlet and the container outlet, for connection to the spraying apparatus whereby powder is entrained by and suspended in the gas under pressure before passing out of the chamber outlet.

2. Means as claimed in claim l, wherein said inlet consists of a plurality of openings in the side Vof the chamber each of which openings is inclined downwardly to project a stream of gas under pressure to the bottom of the chamber.

3. Means as claimed in claim 2 wherein an annular chamber surrounds the powder receiving chamber and communicates with the outer ends of said inclined openings, said annular chamber having an inlet connection for a hose for supplying the gas under pressure.

References Cited in the lle of this patent UNITED STATES PATENTS Number Name Date 1,566,325 Hansen Dec. 22, 1925 1,755,329 McCormack Apr. 22, 1930 1,933,543 Anderson Nov. 7, 1933 

